His nephew and heir was the oligarch Matthew III Csák, who, based on his uncles' acquisitions, became the de facto ruler of his domain independently of the king and usurped royal prerogatives on his territories.

He was born around 1235 as one of the four sons of Matthew I, founder and first member of the Trencsén branch, who served as master of the treasury (1242–1245), and Margaret from an unidentified noble family.

[3] Their son, Stephen Sternberg (or "the Bohemian") later inherited the Csák dominion because of the absence of a direct adult male descendant after the death of Matthew III in 1321.

According to a 1276 testimony of Matthew's mother, lady Margaret, who was nun at the Dominican monastery at the 'Rabbits' Island by that time, Matthew brought his eight-year-old daughter to the monastery in 1271 and asked his mother to intercede with the recently deceased Saint Margaret, and his hopes where fulfilled, as the girl was cured aſter being placed next to the saint's tomb.

[5] Matthew died without male descendants and his brothers had already died for that time, as a result, in 1283, he nominated his nephew, Matthew III to inherit his property and large-scale possessions,[6] which laid the foundation of a de facto independent domain, encompassing the north-western counties of the kingdom (today roughly the western half of present-day Slovakia and parts of Northern Hungary).

During the civil war between Béla IV and his son Stephen, Peter and Matthew Csák were entrusted with gathering a small contingent and marching into Northeast Hungary to rescue the younger king's family.

According to a charter issued in 1273, Matthew II participated in the Battle of Isaszeg in March 1265, where Stephen gained a strategic victory over his father's army.

[15] This kind of "political pendulum" is well illustrated by the fact that Matthew II functioned as ban of Slavonia from 27 November 1272 to April 1273, replacing the rival Joachim Gutkeled.

In 1274, he and Joachim Gutkeled captured and imprisoned the child Ladislaus IV himself and after the release of the royal, they also thrown into prison the king's younger brother, prince Andrew weeks later.

[21] Despite the earlier conflicts, the Csáks were temporarily considered supporters of reconciliation with Ottokar II in 1275, for domestic political reasons, in order to counterbalance the efforts of Joachim Gutkeled and the Kőszegis.

[22] Matthew was one of the two commanders (the other one was his brother, Stephen Csák) of the Hungarian army in the Battle on the Marchfeld on 26 August 1278, where Ottokar II was killed.

Despite Ladislaus' presence, Matthew was the commander of the entire Hungarian contingent in effect, alongside his brother Stephen Csák, according to the Steirische Reimchronik ("Styrian Rhyming Chronicle").

As palatine, Matthew made a proactive role in the conclusion of peace between the Gutkeleds and the Slavonian Babonić family after a series of border wars.

Later Ladislaus IV donated Peter's lands to Denis Osl, who formerly saved the life of Matthew II in the Battle on the Marchfeld.

[25] The activity of papal legate Philip, Bishop of Fermo since late 1279 demolished the fragile peace, when excommunicated Ladislaus IV and placed Hungary under interdict because of the pagan Cumans' growing influence.

At first his wife inherited this property, however she also died shortly, after that Matthew III, son of the youngest brother Peter I acquired the lands.

The Dominican monastery at the 'Rabbits' Island, where the Csák brothers' widow mother lived for a long time, had inherited Gyirok and Nándor (Komárom County).

Perhaps he had also estates or vassals in Pozsony County, maybe one of them was Thomas Hont-Pázmány, for whom Matthew II, as palatine, acted to the Archdiocese of Esztergom, in connection with a payment of a loss.